Overcurrent limiting circuit, overcurrent limiting method, and power supply circuit
US10571942B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 4, 2019 |
| Grant date | Feb 25, 2020 |
| Priority date | — |
| Expiry date | Jan 4, 2039 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05F1/575
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
The overcurrent limiting circuit includes: a limit voltage generation circuit generating a limit voltage which defines the limit current value as a current corresponding to a magnitude of a power supply voltage; a source follower having an output terminal and an input terminal which is connected to a gate of the output stage transistor, and configured to supply from the output terminal a voltage level-shifted from a voltage provided to the input terminal; an error amplifier circuit amplifying a difference between the limit voltage and the voltage supplied from the source follower; and a gate voltage adjustment transistor having a gate to which the voltage supplied from the error amplifier circuit is applied, and controlling a gate voltage applied to the gate of the output stage transistor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.